# Hydraulics and Fluid Mechanics Mcqs

This set of Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Hydraulics and Fluid Mechanics ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Civil Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Railway Engineering Hydraulics and Fluid Mechanics comprehensively.

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## 1. Viscosity of water in comparison to mercury is ______________________?

Higher

Lower

Same

Higher/lower depending on temperature

## 2. The bulk modulus of elasticity __________________?

Has the dimensions of 1/pressure

Increases with pressure

Is large when fluid is more compressible

Is independent of pressure and viscosity

1000

2100

2700

10,000

## 4. Surface tension _____________________?

Acts in the plane of the interface normal to any line in the surface

Is also known as capillarity

Is a function of the curvature of the interface

Decreases with fall in temperature

400 kg/cm2

4000 kg/cm2

40 x 105 kg/cm2

40 x 106 kg/cm2

## 6. Units of surface tension are_________________?

Energy/unit area

Distance

Both of the above

It has no units

## 7. Choose the correct relationship_________________?

Specific gravity = gravity x density

Dynamicviscosity = kinematicviscosity x density

Gravity = specific gravity x density

Kinematicviscosity = dynamicviscosity x density

## 8. For manometer, a better liquid combination is one having______________?

Higher surface tension

Lower surface tension

Surface tension is no criterion

High density and viscosity

## 9. Alcohol is used in manometer, because______?Choose the wrong statement:

its vapour pressure is low

it provides suitable meniscus for the inclined tube

its density is less

it provides longer length for a given pressure difference

Surface tension

Cohesion

Viscosity

0°C

0°K

4°C D. 20°C

All temperature

## 12. The ratio of absolute viscosity to mass density is known as____________________?

Specific viscosity

Viscosity index

Kinematic viscosity

Coefficient of viscosity

Pascal

Poise

Stoke

## 14. Alcohol is used in manometers because_____________________?

It has low vapour pressure

It is clearly visible

It has low surface tension

It can provide longer column due to low density

Dissolved air

Dissolved salt

Suspended matter

All of the above

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